Quick release for foot bars of sewing machines



H. L. RUSSELL QUICK RELEASE FOR FOOT BARS OF SEWiNG MACHINES Feb. 20,1951 Filed Sept. 26, 1949 IN V EN TOR.

Patented Feb. 20, 1951 QUICK RELEASE FOR FOOT BARS OF SEWING MACHINESHarvey L. Russell, Alhambra, Calif. Application September 26, 1949,Serial No. 117,901

2 Claims.

This invention relates to quick release for foot bar of sewing machine,and it has among its salient objects to provide a very simple, prac--tical and economical release for the foot bar of a sewing machinewhereby to make it possible for the operator to move the piece beingsewed in all directions under the foot.

I have illustrated the invention on the accompanying sheet of drawings,which I will now describe;

Figure 1 is a side elevation of the invention removed, showing the partsseparated and partly in section; and

Figure 2 is a view of a sewing machine head, partly broken out to showthe application of the invention thereto.

In the drawing, 3 designates a sewing machine head, with the foot bar 4therein as usual, the upper end of said foot bar being provided with acoiled spring 5, over a reduced bar or rod 6,

,as clearly shown. This mechanism is substantially the same in mostsewing machines.

The invention consists of a tubular member 1, preferably flared at bothends, as shown, whereby the lower end can be placed on the upper end ofthe coiled spring 5, as shown, and the other end is flared slightly toprevent the nut from coming on and being lost.

On said tubular member is a threaded member 3, having a nurled ring 9and a threaded split upper end lil, tapered to receive a lock nut II, tobe screwed thereon for the purpose of clamping the split portions I uponsaid tubular member I, for holding said tubular member 1 down On saidspring 5, or of releasing it so as to allow the foot bar to be free. Inorder to accomplish this, it is only necessary for the operator toloosen the lock nut I I, whereupon said tubular member 1 is free to moveupwardly under the tension of the spring, and thus leave the foot barfree to move as the material being sewed is moved back and forth andaround and around as in quilting or doing other irregular sewing.

It will be noted that the invention is such that it can be substitutedfor the usual holding means for said foot bar by simply unscrewing itand substituting the invention as here described in its place.

I do not, of course, limit the invention to the details of constructionshown for illustrative purposes, except as I may be limited by thehereto appended claims.

I claim:

1. In combination with a sewing machine head and the foot bar operatingtherethrough, of a quick release for said foot bar including a tubularmember to be inserted into said head on the upper end of said foot bar,a threaded member over said tubular member and screwed into said sewingmachine head, and having a split threaded end around said tubularmember, and a lock nut to be turned on to said split threaded end toclamp upon said tubular member for holding it in adjusted positions andfor releasing it to release said foot bar.

2. The combination with a sewing machine head, its foot bar and tensionspring therefor, of a quick release locking means for locking said footbar in adjusted positions, and including an insert tubular member to beplaced over the upper end of said foot bar and its spring, a threadedclamp nut to be screwed into said sewing machine head, around saidtubular member, said clamp nut having a split end bearing on saidtubular member, and a lock nut to be screwed on to said split end forclamping it frictionally around said tubular member, whereby to releasesaid lock nut is to release said tubular member and said foot bar.

HARVEY L. RUSSELL.

No references cited.

